A further recommendation for Songs of Shadows and Dust. It really does give a flavour and feel of Ancient Urban Gang conflict. Had a few games of it and really fun to play as well, the activation system is push your luck which can be quite hilarious when pressure is on. It's played on a smallish table with 7/8 gang members aside with each gang aiming for a different mission and civilians around who can and do join in. A picture of the full table from a recent game. Really inspired by your layout with the bit more crowding and planter boxes!